Method of forming a popgun barrel



Nov. 23, 1937. J. GORA METHOD OF FORMING A POPGUN BARREL Filed Aug. 14, 1935 2 Sheets-Sheet 1 0 a X A R m m m A TT ORNE Y.

Nov. 23, 1937. J. GORA METHOD OF FORMING A POPGUN BARREL Filed Aug. 14, 1955 2 Sheets-Sheet 2 INVENTOR. J 0%77 6'074.

' ATTORNEY.

Patented Nov. 23, 1937 UNITED STATES PATENT OFFICE METHOD OF FORMING A POPGUN BARREL Application August 14, 1935, Serial No. 36,077

4 Claims.

This invention relates to popgun barrels and the object of the invention is to provide a popgun barrel comprising a single sheet of metal formed to shape a double barrel and arranged so 5. that the compression chamber is a sealed cylindrical chamber in each barrel, thus eliminating the necessity of providing a cylindrical insert for each barrel.

A further object of the invention is to provide a double barrel for a popgun formed from a single sheet of metal in which the portion of the sheet forming the compression chamber is accurately fitted to prevent air leakage while the remainder of the barrel is not fitted sufficiently close as to prevent air leakage.

Another object of the invention is to provide a double barrel formed froma single sheet of metal of the character described and having guide members for the piston rods formed from the same sheet integrally with the barrels.

A further object of the invention is to provide a-double barrel popgun formed from a flat metal sheet and having a longitudinal rib formed centrally thereof and the opposite edges of the sheet being rolled inwardly against the rib, the edges of the sheet being beveled through a portion of their length and the rib being provided with shoulders against which the beveled edges seat to provide air tight compression chambers.

These objects and the several novel features of the invention are hereinafter more fully described and claimed and the preferred form of construction by which these objects are attained is shown in the accompanying drawings in which- Fig. 1 is a plan view of a sheet metal blank from which the barrel is made.

Fig. 2 is a section taken on line 2-2 of Fig. 1.

Fig. 3 is a section through the sheet during the forming process.

Fig. 4 is a perspective view of the completed gun barrel.

Fig. 5 is an enlarged section taken on line 5-5 of Fig. 4.

Fig. 6 is a section through the barrel showing one of the piston rods mounted in the guide.

Fig. '7 is a view of the compression chamber and piston mounted therein.

Fig. 8 is a section taken on line 88 of Fig. 6. Fig. 9 is an enlarged section taken on line 9-9 of Fig. 6.

Fig. 10 is a section taken on line Ill-l0 of Fig. .7-

Fig. 11 is an enlarged section taken on line ll-Il of Fig. 4.

Fig. 12 is an enlarged section taken on line l2-l2 of Fig. 4.

The sheet metal blank I from which the gun barrel is formed is shown in Fig. 1 and this blank at one end is provided with side portions having beveled edges 2 shown in Figs. 1 and 2. This blank shown in Figs. 1 and 2 is then formed with an upwardly extending rib 3 shown in Fig. 3 and the remaining portion is provided to form the inturned edges 4. .At the time that the rib 3 is formed, longitudinal shoulders 5 are formed on opposite sides thereof extending longitudinally of the rib and the beveled edges 2 are formed to seat on the shoulders 5, as shown in Fig. 5. This provides a cylindrical compression chamber and, by means of the beveled edges 2 seated on the shoulders 5 of the rib 3, cylindrical compression chambers are formed which are practically air tight throughout the lengthof the beveled edges 2.

The muzzle portions 6 of the barrel are of larger diameter than the compression chambers and the edges of these portions are not beveled and seat on top of the rib 3 as shown in Fig. 11. The portion of the barrel which contains the piston spring and piston rod is shown more particularly in Fig. 12 and the edges 1 of these portions are spaced slightly from the shoulders 5 of the rib 3 as there is no need to make this portion of the barrel air tight and thus the only portion of the barrel which is air tight is the portion having the beveled flanges 2 which seat on the shoulders 5. Consequently, in rolling the barrel to the form shown in Figs. 4, 5, 10, 11, and 12 the barrel is rolled to bring the beveled edges 2 into tight engagement with the shoulders 5 of the rib 3 while the remaining portions of the barrel are not so tightly fitted as will be understood from the said figures.

As shown in Fig. 7, a leather piston 1 is fitted into the compression chamber and is provided with a piston rod 8. A coiled spring 9 is positioned about the piston rod 8 and engages against the piston 'l at one end and also seats on the inturned lug H1 at the opposite end. The end of the piston rod 8 opposite the piston is shown more particularly in Figs. 6 and 8 and is provided with a portion l I having a return bent end l2 adapted to seat in the notch 13 in a trigger l4. Each trigger I4 is mounted on a shaft l5 shown more particularly in Fig. 9 while a spring I 6 is provided tending to turn the trigger M in a counter-clockwise direction on the pin l5 shown in Fig. 6. Each trigger I 4 is provided with a curved face I! over which the end l2 of the piston rod 8 is adapted to ride as this rod is drawn to the left of Fig. 6. A slotted plate I8 is provided for drawing the piston rods of both barrels back at the same time, the plate I8 being shown more particularly in Figs. 6 and 8.

The end of the slot in this plate engages the shoulder I9 of each trigger as shown in dotted lines in Fig. 6 and this plate I8 is drawn back when the gun is cooked. While not here shown, the plate I8 is connected to the gun butt so that as the gun butt is cocked this plate I8 is drawn to the left of Fig. 6. In the position shown in full.

lines in Fig. 6, when the trigger I4 is pulled, the trigger is turned on the pivot.l5i releasing.the rod 8 to action by the spring, 9 which throws the. rod 8 to the dotted position shown in. Fig. 6.: so that the rod travels longitudinally of the slotv in the plate I8. The portion II of each rod rides in a channel 2| formed integrally with-therear of the gun barrel as shown in Figs. 1 and-.8. These channels 2i maintain the piston rods 8 in proper position tobe engagedv bythe respective trigger 4 and by means of the slots in the .plate I8 either triggen may be released independently of. the other and will only discharge the cork in the respective barrel. In fact, with the; arrangement shown, even Whencnly. one trigger has been released to release itsrod and plunger, the gun may be re-cocked without? disturbing: the otherv trigger or. pistonlrod which may be in the cooked position; As shown-in Fig. 7a. cork 22 is positioned within the enlarged muzzle 6:0f the gun and fits into. the end. of the compression. chamber 28. A slot: 23 isaprovidediin; each barrelto. the rear of. the respective compression chamber. 28.v and axretainer. rod 24 isprovided. having anend 25 engaged: between. the coils of. the spring..9.. As shownzinFig; '7, this retainer'rod 2.4'exten'dsfonward and througna slot: 2.6; providedin'the enlargedgmuzzle ii :and the. endiof the. rodis .formed with'asloop- 21 engaging the cork: 22'tov holdlit in the end of the'compression chamben.

When the trigger is'released, the;ro,d-.8'mov.es:

from the .positionshownin full linesin Fig. .6to

that shownindottedllines. This moves .the piston; I forward and the. retainerv rod; 243at the same.

time and as theairpressure builds upiinxathe com.-

pression. chamber 28" the. cork. 22: is; discharged.

from the end of; the compression chamber but is retainedin the enlarged muzzle-6 bythe loop. 21

on' the. retainer rodt24. A- slopingshoulder 29 is.

provided. between the enlarged. muzzle 6. and' the compressionchamber'm' so thatiwhen. the gun is again cockedthe piston rod. 8.is. drawn to. the. leftof Fig.7. andtheretainer rod is also; drawn.

engages thezendlfacemf. thecork 22 andpushes.

the cork back into the endofthe compression chamber. 28;. the sloping. shoulder. 29 acting as a. guide to guide-the cork back into :the compression;chamber.

As .will benoted from Figs. 1, .4,,and 6 each;bar-

relpis provided with. a. slot.30: at the end of. the.

respective guide channel 2 I. andthe adjacentportion 3|: ofztheibarrelcomes at the end of each guidechannel sorthat' in: the fired position the portion? II; of the respective piston rodfi'engages the end 3| of the; respective barrel portion and the endof the corresponding slot.in the,plateyl8- at about the same time to provide-a limit for forward movement of the piston rod 8. ,It will thus be seen that the entire barrel is formed from a single stamping to provide an enlarged muzzle 6, an air tight compression chamber 28, guide channels 2| and a barrel portion between the guide channels 28 and the compression chamber. The barrel is also provided with apertures 32 shown in Figs. 1 and 4 to which a. cover and trigger guard (not here shown) may be secured.

From the foregoing description it becomes evident that the device is Very simple and eiiicient in" operation, provides a one piece barrel construction including a compression chamber, is very cheap to manufacture and provides a device which accomplishes the objects described.

Having. thus fully described my invention, its utility and mode of operation, What I claim and desire to secure by Letters Patent of the United States-is- 1. A method of forming a popgun barrel consisting. in. stamping a-blank with parallel edges from asheetxofzmetal, beveling the parallel edges througha minor portion of their length, rolling the .parallel: edgesinwardlyto the center of the.

sheet;and:forming'araised rib in thecenter of the sheet; forming: a shoulder on. each. side of the raised: rib andseating the beveled edges. of the barrel tightly on said shoulders to form comprese sion' chambers: andishaping. one end of the. blank to provide. paralleLguide channels extendingin' spaced parallel relation; on: the undersidev of the formed barrels.

2. A method of forming a popgun.barrel:con.-.

sisting in stampinga blankxfrom a sheet of metal,-.

forming a raised longitudinal rib extending, cen-. trally through .the blank and parallel with the edgesof the blank,...forming. a shoulder in; the. metal on each. side: 01"" the. rib, inturning. the. edges. ofthe-blank against said rib,.beveling each:

edge of .the blank to; fit tightly against there.- spjective shoulder and thepportionofthe ribabove the, shoulderand forming a pair of guide channels'v in. the: sheet extending in. parallel relation. at a distance from said'bevelededges.

3-. A method of forming azpopgun barrel consistingzin-iorming; a-rib longitudinally of a sheet of'metalzand spaced equi-distantly from the side edges thereof, forming a. longitudinal shoulder on eachsideofthe rib and rolling each edge of the sheet to bring the edge into engagement with the-rib, be-veling1a-: portion of each edge to fit tightly against the respective shoulder to form a pairof compression chambers and forming a guide channelimone end of each barrel and an enlargedmuzzle. in the opposite end thereof.

4. A method of forming a popgun barrel consistingin forming'a-longitudinal rib centrally of a sheet. of metal, inturning the side edges of the sheet against said rib, forming a longitudinal shoulder in the metalon each side of therib, beveling a portion of each edge of thesheet to fit tightly. against the-shoulder and portion ofthe rib above the shoulder to form a compression chamber, forming anenlarged muzzle at one end of eachbarrel, the edges of the muzzle portion when inturnedfseating in top of the riband the portion of each barrel between 'the muzzle and compression chamber being tapered.

JOHN GORA. 

